Remove lubrication between the two surface. Lubricants like oil, grease, petroleum jelly, and so on can greatly reduce friction between two objects or surfaces.

Methods to Increase Friction

Increasing friction can be beneficial in various situations, such as improving traction, preventing slipping or sliding, or enhancing the grip between two surfaces. Here are several methods that can be used to increase friction:

1. Increase the Roughness of Surfaces:
The roughness of surfaces in contact affects the friction between them. By increasing the roughness of one or both surfaces, the contact area between them increases, leading to higher friction. This can be achieved through methods such as sanding, using abrasive materials, or adding texture to the surfaces.

2. Apply Friction-Enhancing Substances:
Certain substances can be applied to surfaces to increase friction. These substances, such as adhesives, tacky materials, or rubber coatings, create a layer that enhances the grip between the surfaces and increases friction.

3. Increase the Normal Force:
Friction is directly proportional to the normal force between two surfaces. By increasing the weight or applying a downward force on an object, the normal force between the object and the surface it's in contact with increases. This, in turn, increases the frictional force.

4. Increase the Coefficient of Friction:
The coefficient of friction is a measure of the frictional force between two surfaces. By increasing the coefficient of friction, the frictional force can be increased. This can be achieved by using materials with higher coefficients of friction or by modifying the surfaces to increase their grip.

5. Increase the Angle of Inclination:
The angle of inclination or slope affects the frictional force acting on an object. By increasing the angle of inclination, the component of the object's weight acting parallel to the slope increases, resulting in higher friction.

6. Use Interlocking Mechanisms:
Interlocking mechanisms, such as hooks, teeth, or grooves, can be employed to increase friction between two surfaces. These mechanisms create a more secure and interlocked connection, preventing slipping or sliding and increasing friction.

7. Increase the Speed of Movement:
The speed of movement between two surfaces can also affect the frictional force. In some cases, increasing the speed of movement can result in higher friction. This is particularly relevant for viscous fluids or materials that exhibit a shear-thickening behavior.

In conclusion, there are several methods to increase friction, including increasing the roughness of surfaces, applying friction-enhancing substances, increasing the normal force, increasing the coefficient of friction, increasing the angle of inclination, using interlocking mechanisms, and adjusting the speed of movement. These methods can be used in various situations to improve traction, enhance grip, and prevent slipping or sliding.